Here's something you don't see every day - it's a concept based on a concept, and it comes from London coachbuilder Prindiville. Prindiville's eight-only Limited Edition Lamborghini Aventador is already on sale, and it's so keen to get its hands on the Aventador J Concept which Lamborghini showed in Geneva in March, that it has released this concept based on the original concept. Power is up from 700 to 805 bhp, but every panel, from the front bumper to the rear diffuser and rear wing is reshaped and lightened. Prindiville claims its J will sprint from 0 to 62 mph (100 km/h) in around 2.5 seconds, which would make it one of the fastest four-wheelers on public roads anywhere.